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Message-Id: <20230810074704.2042664-2-xiaolei.wang@windriver.com>
Date: Thu, 10 Aug 2023 15:47:03 +0800
From: Xiaolei Wang <xiaolei.wang@...driver.com>
To: catalin.marinas@....com, akpm@...ux-foundation.org,
glider@...gle.com, andreyknvl@...il.com, vbabka@...e.cz,
zhaoyang.huang@...soc.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] lib/stackdepot: Bail out in __stack_depot_save() if the stack_table is not allocated
The __stack_depot_save() may be used by some subsystems even before
the stack depot is initialized. So add a check of stack_table in
__stack_depot_save() to make sure no oops in this case.
Fixes: 56a61617dd22 ("mm: use stack_depot for recording kmemleak's backtrace")
Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
---
lib/stackdepot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 2f5aa851834e..a0651d013a0d 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -376,7 +376,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
*/
nr_entries = filter_irq_stacks(entries, nr_entries);
- if (unlikely(nr_entries == 0) || stack_depot_disabled)
+ if (unlikely(nr_entries == 0) || stack_depot_disabled || unlikely(!stack_table))
goto fast_exit;
hash = hash_stack(entries, nr_entries);
--
2.25.1
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